Try a few things things:
1) set content type to "application/*pdf"*
2) set content type to "application/*pdf**; charset=latin1"*
*3) *
*from io import BytesIOreturn BytesIO(pdf.output(dest='S'))*
On Monday, 20 April 2020 22:28:19 UTC-7, Armin Würtenberger wrote:
>
> Hi,
>
> I am developing apps which are heavily depending on the creation of
> pdf-files. This workes great using fpfdf and python2.7. I try to go on and
> moving to pyhton3.7 which is, so far no problem. The real challenge for me
> is to generate correct pdf-files:
>
> Heres how I did it in python2.7:
>
>
> @service.run
> def generatePDF(**kwargs):
> from gluon.contrib.fpdf import fpdf
> from gluon.contrib.fpdf.php import UTF8ToUTF16BE, UTF8StringToArray
> from gluon.contenttype import contenttype
>
> pdf = fpdf.FPDF("P","mm","a4")
> pdf.l_margin, pdf.r_margin = 20, 10
> pdf.add_font('Sans', '', 'DejaVuSansCondensed.ttf', uni=True)
> pdf.add_font('Sans', 'B', 'DejaVuSansCondensed-Bold.ttf', uni=True)
> pdf.add_font('Sans', 'I', 'DejaVuSansCondensed-Oblique.ttf', uni=True)
> pdf.add_font('Sans', 'BI', 'DejaVuSansCondensed-BoldOblique.ttf', uni=
> True)
> pdf.add_font('Serif', '', 'DejaVuSerifCondensed.ttf', uni=True)
> pdf.add_font('Serif', 'B', 'DejaVuSerifCondensed-Bold.ttf', uni=True)
> pdf.add_font('Serif', 'I', 'DejaVuSerifCondensed-Italic.ttf', uni=True
> )
> pdf.add_font('Serif', 'BI', 'DejaVuSerifCondensed-BoldItalic.ttf', uni
> =True)
>
> pdf.add_page()
> pdf.set_font('Sans','B',20)
> pdf.set_y( 25 )
> pdf.cell( w=pdf.w-(pdf.l_margin+pdf.r_margin), h=25,
> align="C",
> border=1,
> txt="Hello World", ln=2 )
>
>
> response.headers["Content-Type"]=contenttype(".pdf")
> response.headers['Content-disposition'] = 'attachment;
> filename=mypdf.pdf'
>
> return pdf.output(dest='S')
>
>
> The downloaded file is a PDF, the file itself is latin1 encoded. (checked
> with vim; set fileencoding)
>
> If I do the very same, using web2py and python3.7, I am getting the
> pdf-file as byte-stream - starting with the b'
>
> b'%PDF-1.3\n3 0 obj\n<</Type /Page\n/Parent 1 0 R ...
>
>
> fileencoding utf-8, which I understand (somehow) since the fpdf does serve
> a byte-stream.
>
> To overcome this, I tried to change the last line to:
>
>
> return pdf.output(dest='S').decode('latin1')
>
>
> and I get a file which is no valid pdf, fileencoding is utf-8
> Once I manually change the fileencoding of the downloaded file to latin1,
> it becomes a valid and readable pdf-file.
>
> Using
>
> pdf.output("myfile.pdf",dest='F')
>
> does produce a valid, latin1 - encoded file on disc however.
>
> I tried different variants as well, but I got stuck and was not able to
> produce a valid pdf.
>
> Can someone suggest a way to produce a valid download?
> At first I was suspecting some missing response - header information, but
> I did not find one which solved the problems.
>
> Any help would be appreciated!
>
> I am working on macOS, using Safari, but tried Firefox and Chrome as well
> - same result.
>
> Cheers, Armin
>
--
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